package com.yydream.common.filters;

import com.yydream.common.constant.HttpStatus;
import com.yydream.common.constant.RedisKeyEnums;
import com.yydream.common.utils.JwtUtils;
import com.yydream.common.utils.RedisCache;
import com.yydream.domain.LoginUser;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.filter.OncePerRequestFilter;

import javax.servlet.FilterChain;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Objects;

@Component
public class JwtAuthenticationTokenFilter extends OncePerRequestFilter {

    @Autowired
    private RedisCache redisCache;

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain) throws ServletException, IOException {
        //获取token
        String token = request.getHeader("token");
        if (!StringUtils.hasText(token)) {
            //放行
            filterChain.doFilter(request,response);
            return;
        }
        //解析token
        String userId = JwtUtils.getUserId(token);
        //从redis中获取用户信息
        userId = userId.substring(userId.indexOf("=") + 1 , userId.indexOf("}"));
        String redisKey = RedisKeyEnums.LOGIN.getKey() + userId;
        LoginUser loginUser = redisCache.getCacheObject(redisKey);
        if (Objects.isNull(loginUser)){
            throw new RuntimeException(HttpStatus.INVALID_TOKEN.getMsg());
        }


        //存入SecurityContextHolder
        // TODO 获取权限信息封装到Authentication中
        UsernamePasswordAuthenticationToken usernamePasswordAuthenticationToken = new UsernamePasswordAuthenticationToken(loginUser,null, loginUser.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(usernamePasswordAuthenticationToken);
        //放行
        filterChain.doFilter(request,response);
    }
}
